What’s the process on how a shrunken head is created?

Step 1. Aquire head.
Step 2. Cast Voodoo Head-Shrink Magic
Step 3. Enjoy your Shrunken Head.

I really don't understand how this is hard for you.
 
Head is hollowed out and the skin is shrink-wrapped around a wooden or rubber sphere. It's a taxidermy really
I think I remember reading that they filled it repeatedly with hot sand.

OP, shrunken heads can be disappointing; they're not likely to look much like they did in life. It's easier (and less problematic legally) to make carved apple heads.
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